Why the Windows kernel can connect slower than Linux

Fundamentals of Operating Systems Course

Why Windows Kernel connects slower than Linux

I explore the behavior of TCP/IP stack in Windows kernel when it receives a RST from the backend server especially when the host is available but the port we are trying to connect to is not. This behavior is exacerbated by having both IPv6 and IPv4 and if the happy eye ball protocol is in place where IPv6 is favorable.

0:00 Intro
0:30 Fundamentals TCP/IP
3:00 Unreachable Port Behavior
6:00 Client Kernel Behavior (Linux vs Windows)
11:40 Slow TCP Connect on Windows
15:00 localhost, IPv6 and IPv4
20:00 Happy Eyeballs
28:00 Registry keys to change the behavior
31:00 Port Unreachable vs Host Unreachable

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Stay Awesome,
Hussein

[hnasr]

Fundamentals of Operating Systems Course

[bipulmishra]

Recently started watching your videos.
Feels nice to know things in depth❤

[spicynoodle]

I really enjoy these long, deep dives. You always cover interesting topics

[nathansherrard]

The term "Happy Eyeballs" is basically a euphemism for "good user experience". The RFC was trying to balance network load and efficiency versus fast enough timeouts that users wouldn't readily notice that they were timing out and failing over to another address family. Thus the delay was short enough (200-300ms) that their eyeballs remained "happy" as it didn't negatively impact their experience.

[eminence_grise]

I have just finished listening to the podcast about this topic and decided to subscribe to your YouTube channel. Thank you for sharing interesting things!

[esra_erimez]

Great explanation of Window's TCP/IP. Douglas Comer would be proud.
P.S.: you have some very strange bots in your comments.
Edit: How many people know who Douglas Comer is?

[charliesta.abc]

One day the dev tool them all series will make a comeback

[benlu]

I like how he didn’t actually try setting the registry option on his machine

[anandmoon]

Its seems that server would not be listning on ipv6 port for this behavior 😮

[devyetii]

Thanks for the great video, as USUAL <3
One more question that pops up, what happens in WSL2, is it the same?

[everyhandletaken]

I know why.. cos Windows is terrible 😉

[esra_erimez]

16:02 In 2024 you might need to have IPv6 disabled on Windows due to a zero day. Edit: please see CVE-2024-38063

[codingbond]

You try to sound clever, but in reality you are not